Superman: Doomsday (PG-13)
Official site with trailers!
This will be very cool. I already know EVERYTHING about it. Although it does not go with the previous DC/Bruce Timm animated universe ... it appears that it can in your mind. Why? Same animation style and the story continues anyway! Lois and Superman had just started getting together in the cartoon series. Here they are in a relationship making it appear to happen afterwards. It's really up to you to see it as a new 1-Shot movie (Which it is.) or to tie it into the other series. Discuss this cool new movie here!
9-18-2007 means it came out the other day! Rent it right away! ^_^
Justice League: The New Frontier
This should be really cool. Read all about it on that link and discuss it here!
Teen Titans: The Judas Contract
This does not go with the Teen Titans cartoon series. In fact ... this story was already told in the series. This movie will be based more closely on the comic book series. Also, the character models should be grown up like in the comics rather than kiddie small versions of the animated series. Discuss this cool movie here.
Mahou Sensei Negima Forever!